Full Length ArticleDeep vein thrombosis in upper extremities: Clinical characteristics, management strategies and long-term outcomes from the COMMAND VTE Registry
Introduction
Venous thromboembolism (VTE), including pulmonary embolism (PE) and deep vein thrombosis (DVT), is a major health problem in the world [1,2]. PE is caused by blockage of pulmonary arteries by thrombus, which is developed in veins and travels through the blood stream. The sources of thrombus are thought to be mostly veins in lower extremities, whereas DVT in upper extremities, which usually refers to thrombosis of the axillary or subclavian veins, rarely occurs spontaneously and sometimes develops as a complication of central venous catheter placement or cancer [3,4]. Historically, DVT in upper extremities was considered as a rare self-limited disease [5,6]. However, recent studies reported that DVT in upper extremities might have significant complications, including PE, loss of vascular access, superior vena cava syndrome, and post-thrombotic syndrome [7,8]. Furthermore, DVT in upper extremities could be increasing, due to widespread use of central venous catheters and increase in cancer survivors.
To date, no randomized controlled trials have evaluated treatment strategies of patients with DVT in upper extremities, leading to uncertainty in optimal treatment strategies including anticoagulation therapy. Furthermore, few studies have evaluated long-term clinical outcomes of patients with DVT in upper extremities. Therefore, we sought to evaluate the clinical characteristics, management strategies, and long-term outcomes of patients with DVT in upper extremities in a large observational database in Japan.
Section snippets
Study population
The COMMAND VTE (COntemporary ManageMent AND outcomes in patients with Venous ThromboEmbolism) registry is a physician-initiated, retrospective, multicenter cohort study enrolling consecutive patients with acute symptomatic VTE objectively confirmed by imaging examinations (ultrasound, contrast-enhanced computed tomography (CT), ventilation-perfusion lung scintigraphy, pulmonary angiography, or contrast venography) or by autopsy among 29 centers in Japan between January 2010 and August 2014.
Patient characteristics
In the entire study population, the mean age was 67 years, 61% were women, and mean body weight and body mass index were 57.6 kg and 23.1 kg/m2, respectively. There were 74 patients (3.0%) with DVT in upper extremities and 2424 patients (97%) with DVT in lower extremities. The baseline patient characteristics were different in several aspects between the 2 groups (Table 1). Patients with DVT in upper extremities were younger, more often had active cancer at diagnosis and central venous catheter
Discussion
The main findings of the current study were as follows; 1) Among patients with DVT in upper or lower extremities, the prevalence of patients with DVT in upper extremities was 3.0%; 2) Patients with DVT in upper extremities more often had central venous catheter placement and active cancer, and less often had concomitant PE; and 3) The risk for recurrent VTE was not significantly different between patients with DVT in upper extremities and those in lower extremities.
DVT in upper extremities is a
Study limitations
The current study has several limitations. First and most importantly, the absolute number of patients with DVT in upper extremities was small (N = 74), although it was derived in a large observational database of patients with VTE. Due to lack of adequate statistical power, we could not conduct detailed analyses among patients with DVT in upper extremities. Therefore, the results of the current study should be regarded as exploratory and hypothesis generating. Especially, as for major
Conclusions
The prevalence of patients with DVT in upper extremities was 3.0% in the current large-scale real-world registry. Patients with DVT in upper extremities more often had active cancer at diagnosis and central venous catheter use as a transient risk factor for VTE, and less often had concomitant PE. Patients with DVT in upper extremities had similar long-term risk for recurrent VTE as those with DVT in lower extremities despite shorter duration of anticoagulation.
Acknowledgements
We appreciate the support and collaboration of the co-investigators participating in the COMMAND VTE Registry. We are indebted to the independent clinical research organization (Research Institute for Production Development, Kyoto, Japan) for technical support.
Conflicts of interest
Dr. Yamashita received lecture fees from Daiichi-Sankyo, Bristol-Myers Squibb, Pfizer, and Bayer Healthcare. Dr. Morimoto received lecture fees from Mitsubishi Tanabe Pharma and Pfizer Japan and consultant fees from Asahi Kasei, Bristol-Myers Squibb, and Boston Scientific. Dr. Akao received lecture fees from Pfizer, Bristol-Myers Squibb, Boehringer Ingelheim, Bayer Healthcare and Daiichi-Sankyo. Dr. Kimura serves as an advisory board member for Abbott Vascular and Terumo Company. All other
Funding
The COMMAND VTE Registry is supported by the independent clinical research organization (Research Institute for Production Development, Kyoto, Japan) and research funding from Mitsubishi Tanabe Pharma Corporation. The research funding had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
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